Vertex AI vs Writesonic: Pricing Comparison 2026
Side-by-side pricing comparison of Vertex AI and Writesonic. See all plans, features, and costs at a glance.
Bottom line: Vertex AI starts at $2/mo, making it $77/mo cheaper than Writesonic ($79/mo). Neither offers a free plan.
Last updated: August 24, 2026
Vertex AI - Vertex AI starts at $77/mo lower ($2/mo vs $79/mo), offers 15 tiers vs 4.
Vertex AI vs Writesonic: Quick Pricing Facts
| Feature | Vertex AI | Writesonic |
|---|---|---|
| Starting Price | $2/mo | $79/mo |
| Number of Plans | 15 | 4 |
| Free Tier | No | No |
| Pricing Model | usage-based | freemium |
| Annual Discount | N/A | N/A |
Vertex AI is the more affordable option, starting at $2/mo compared to Writesonic's $79/mo. Both are AI & ML tools with 19 combined pricing plans and 0 features compared.
Vertex AI uses usage-based pricing while Writesonic uses freemium pricing, which may affect your total cost at scale.
Review the detailed tier-by-tier comparison above to see exactly which features are included at each price point and find the best fit for your AI & ML needs.
| Pricing Plans |  Vertex AI Try free |  Writesonic Try free |
|---|---|---|
| Tier 1 | cached Custom pricing | STARTER $79/monthCheapest |
| Tier 2 | $14 per 1,000 Grounding Queries $14/monthCheapest | BASIC $199/month |
| Tier 3 | $14 per 1,000 queries $14/monthCheapest | GROWTH $399/month |
| Tier 4 | $35 per 1,000 Grounding Prompts $35/monthCheapest | ENTERPRISE Custom pricing |
| Tier 5 | $45 per 1,000 Grounding Prompts. $45/monthCheapest | - |
| Tier 6 | $25 per 1,000 grounded prompts $25/monthCheapest | - |
| Tier 7 | $45 per 1,000 Grounding Prompts $45/monthCheapest | - |
| Tier 8 | Gemini Flash Custom pricing | - |
| Tier 9 | Gemini 2.0 Flash $2/monthCheapest | - |
| Tier 10 | $45 per 1,000 grounded prompts $45/monthCheapest | - |
| Tier 11 | $35 per 1,000 Grounding Prompts. $35/monthCheapest | - |
| Tier 12 | Model Custom pricing | - |
| Tier 13 | Open Source Model Custom pricing | - |
| Tier 14 | Duration Custom pricing | - |
| Tier 15 | $10 per 1000 searches $10/monthCheapest | - |
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Frequently Asked Questions: Vertex AI vs Writesonic
Which is cheaper, Vertex AI or Writesonic?
How many pricing plans does Vertex AI have vs Writesonic?
Does Vertex AI or Writesonic offer custom enterprise pricing?
What pricing models do Vertex AI and Writesonic use?
How do Vertex AI and Writesonic compare for AI & ML?
Sources
- Vertex AI Official Pricing- Vendor pricing page
- Writesonic Official Pricing- Vendor pricing page
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